A free app and service that helps families create healthy digital habits and stay connected. It’s designed to support both online safety and real-world awareness by offering tools for screen time management, content filtering, and location sharing
Hello, thank you for reaching out to Microsoft Q&A.
When you sign in with your Microsoft account here, do you see an unknown account as the Organizer of your family group? How did you join the group before?
https://account.microsoft.com/family/home
According to the Microsoft article here, only the organizer of the family group can remove members.
Reference:
How to leave a Microsoft family group
If your account is stuck as a child in an unknown family group, unfortunately, there are no other options other than switching to a new Microsoft account.